The Azenis RT660+ is Falken's Extreme Performance Summer tire developed for motorsports enthusiasts, participants in track days, or any driver looking for competition-ready levels of dry traction and handling. The Azenis RT660+ is designed to provide maximum performance in warm, dry to damp conditions, and like all Extreme Performance Summer tires, is not intended to be serviced, stored, nor driven in near-and below-freezing temperatures, through snow or on ice.
The Azenis RT660+ builds off of the popular RT660 with several refinements, including better heat management, weight reduction and a larger contact patch to improve handling predictability. The track-tested motorsports-derived tread compound remains unchanged, beyond manufacturing improvements to enhance durability while still delivering superior traction for acceleration, braking, and handling in dry and wet conditions. The low-void, directional pattern maximizes the rubber in contact with the surface. Massive shoulders deliver extreme levels of lateral grip, and the broad, continuous center rib provides solid on-center feel and longitudinal traction for acceleration and braking. Deep, circumferential grooves and full-depth notches help evacuate water from the contact patch to enhance hydroplaning resistance.
The internal construction of the Azenis RT660+ features a two-ply, polyester casing utilizing Falken's Crosshatch Carcass design to enhance handling and stability. Two wide, steel belts support the tread area and are reinforced by a single polyamide cap plies to further improve handling and high-speed capability.
Note: Tires exposed to temperatures of 20 degrees F (-7 degrees C) or lower must be permitted to gradually return to temperatures of at least 40 degrees F (5 degrees C) for at least 24 hours before they are flexed in any manner, such as by adjusting inflation pressures, mounting them on wheels, or using them to support, roll or drive a vehicle.
Flexing of the specialized rubber compounds used in Extreme Performance Summer tires during cold-weather use can result in irreversible compound cracking. While compound cracking is not a warrantable condition because it occurs as the result of improper use or storage, tires exhibiting compound cracking must be replaced.
Related Information: Can Tires Be Shaved For Autocross / Track Use / Competition? | What Tire Air Pressure Do I Use For Track And Autocross? | How Do I Store Track & Competition DOT Tires In Cold Temperatures?
When it comes to track days or race events, Extreme Performance Summer tires are a popular choice. In this test, we took seven exciting EP tires to a local road course to see how they stack up in this environment. From newcomers to category stalwarts, this test will help racers of all stripes find the right tire for their needs. If you haven’t already, see how this same lineup did in our standard test, Extreme Performance Summer – 2025 Test 4D.
Read the Full Test Report
Tire Category: Extreme Performance Summer
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When it comes to track days or race events, Extreme Performance Summer tires are a popular choice. In this test, we took seven exciting EP tires to a local road course to see how they stack up in this environment. From newcomers to category stalwarts, this test will help racers of all stripes find the right tire for their needs. If you haven’t already, see how this same lineup did in our standard test, Extreme Performance Summer – 2025 Test 4D.
Read the Full Test Report
Extreme Performance Summer tires are at home during track days and racing events, but they’re also excellent at helping drivers get the most spirited experience out of their commutes or weekend drives. Our standard test format, which consists of road rides, dry and wet test track handling, dry and wet skid pad, and dry and wet braking, is designed to highlight these different areas and help our customers make the best choice for their needs.
Read the Full Test Report
Testing Extreme Performance Summer, Streetable Track & Competition, and Racetrack & Autocross Only tires means returning to GingerMan Raceway for head-to-head testing. This year, a whopping 19 tires took part in this portion of the test to find out one thing: which are the fastest track and streetable track tires. Also included this year is a full racing slick, a Tire Rack first!
The Azenis RT660+ is an Extreme Performance Summer tire that’s competition-ready. Whether it be track days or autocross events, the Azenis RT660+ was developed with automotive enthusiasts at the forefront by building upon the successes of its popular predecessor, the Azenis RT660.
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